Physics 320 Astrophysics I:  Lecture #3 HW Problem Prof. Dale E. Gary NJIT

Imaging the Solar Eclipse

Prob. 3.1: In Lecture 3, we gave the equation for plate scale, and an example of how to calculate the linear size of an object at the focal plane of a telescope. For the 2017 August 21 total solar eclipse, I used an 80 mm f/6 telescope and the ZWO ASI120 camera, whose specifications are listed in the table below. (Use the fact that 1 degree = 60 arcmin = 3600 arcsec.)

a. What is the plate scale (in mm/degree) for this telescope?

b. What is the angular size, in arcsec, that one pixel of this camera would represent?

c. What is the field of view of the camera, horizontally and vertically, in arcminutes?

d. Will the Sun (angular size 1/2 degree) fit in the camera frame horizontally? Vertically?

Model Number ASI120MC-S Color ZWO ASI120 AR0130CS CMOS 3.5 x 3.5 1280 x 960 Natural Convection Frame Transfer 12-Bit 64 microsecond 1000 seconds Windows Camera Driver, ASCOM Driver, SharpCap, FireCapture, Stakkert 2 USB 3.0 No, Sold Separately 2.44 x 1.1 inch 0.22 1 year